1919] CONTENTS. Ill 



AGRICULTURAL BOTANY. 



Page. 



Hardening process in plants and developments from frost injury, Harvey 26 



The transpiring power of plants, Shreve 27 



"Water loss by evaporation and gain by absorption in colloidal gels, Shreve. ... 27 



Colloidal phenomena in the protoplasm of pollen tubes, Lloyd 28 



Effect of acids and alkalis on growth of protoplasm in pollen tubes, Lloyd .... 28 



Construction of biocolloid exhibiting relations of plants, MacDougal 28 



Imbibition in biocolloids, MacDougal 29 



Imbibition of gelatin and agar gels in sucrose and dextrose, Free 29 



Gas interchange in Mesembryanthemum and other succulents, Richards 29 



Desiccation and respiration in succulent plants, Long 29 



Rate and course of growth of succulents, MacDougal 30 



The carbohydrate economy of cacti, Spoehr 30 



Root growth of Prosopis vrlutina and Opuntia versicolor, Cannon 30 



Effect of ammonium sulphate on soy beans in sand cultures, Wolkoff 30 



Growth of wheat (Tril bum ) and corn (Zea), MacDougal 31 



The individuality of the bean pod as compared with the bean plant, .Boas. 31 



FIELD CROPS. 



[Work with field crops on the Truckee-Carson farm in 1917], Headlcy 31 



Report of agronomy department, Beeson 32 



Root crop culture in South Dakota, Champlin and Winright 32 



Grasses of the West Indies, Hitchcock and Chase 32 



Victorian grasses, Audas 32 



Variations in secondary rootlets in cereals, Walworth and Smith 32 



Cereal culture in the Province of Alemtejo, Portugal 33 



Normal self-fertilization in corn, Hayes 33 



Linkage in maize: The C aleurone factor and waxy endosperm, Bregger 33 



Corn culture in South Dakota, Champlin and Winright 34 



Budding incompatible cottons 34 



Length of cotton lint, crops 1916 and 1917, Pryor 34 



[Jerusalem artichoke in France], Schribaux 35 



The Jerusalem artichoke as a war plant, Howard 35 



Nettle as a textile, de Lapparent 35 



Relation of size of sample to kernel-percentage in oats, Garber and Amy 35 



A preliminary study of the bleaching of oats with sulphur dioxid, Baston 35 



[Peanut culture in southern France], Morel 36 



The book of the potato, Sanders 36 



Grow more rape, Evvard and Hechler 36 



Sudan grass, Stewart and Foster 36 



Sugar beet seed [in France], Saillard 36 



[Value of seed cane from different sourcesj, Ledeboer and van Dapperen 37 



Statistics on sugar cane varieties in Java in 1912, van Harreveld 37 



Statistics on sugar cane varieties in Java in 1913, van Harreveld 37 



Sugar cane varieties, Jeswiet 37 



Sugar cane variety tests in west Java, 1915-16, Ledeboer 37 



Observations of sugar cane variety tests, van Harreveld 37 



[Annual report of the Bureau of Sugar Experiment Stations], Jarvis 37 



A sterile dwarf form of Deli tobacco originated as a hybrid, Honing 38 



The first Mendelian example of Deli tobacco, Honing 38 



Wheat breeding ideals, Snyder 38 



An anomaly of wheat anthers, Anthony 39 



A study of Colorado wheat, Headden 39 



Effect of fertilizers on wheat, 1917-18 crop, Spurway 39 



Official grain standards for wheat [and shelled corn], Houston 39 



Handbook official standards for wheat and corn, compiled by Boerner 39 



g! lover and alfalfa seed investigations], Franck and Wieringa 39 



esistance of seeds to desiccation, Harrington and Crocker 39 



Cleaning seed 40 



The growth of sheep sorrel in calcareous and dolomitic media, Maclntire 40 



HORTICULTURE. 



Vegetation and reproduction with reference to tomato, Kraus and Kraybill. . . 40 



[Horticultural investigations], Rolfs 42 



Report of the assistant horticulturist, McClelland 42 



